Chaplet



' Patented May 23, 1933 I W mental magnesium,

W core in position,

W the pouring operation and that a was obtained. Various low me tingmeta s UNITED STATES PATENT OFFICE H mane BROWN, or momma, IIOHIGAN,assmxoa re rim now cnnmcu, comm;

0E MIDLAND, MICHIGAN, A CORPORATION OI MICHIGAN CHAPLET llo Drawing.

vention to provide an improved means for 5 maintaining dry sand cores ina substantially fixed position in a mold whereby the making of coredmagnesium castings is facilitated.

The term magnesium is used herein and in the appended claims to mean notonly elebut also alloys thereof wherein the magnesium contentpredominates.

l have found that the difliculties inhering to prior holding the core inposition maybe overcome by using a chaplet comprising cadmium.

'lo the accomplishment of the foregoing I and related ends, theinvention, then, consists f of the steps and product hereinafter fullydescribed and particularly ointed out in the claims, the followingescription setting forth, in detail one mode of carrying out theinvention, such disclosed mode illustrating, 9% however, but one of thevarious ways in which the principle of the invention may be used.

in the casting of maesium it has been general practice to avoi insofaras possible the use of chaplets for holding a dry sand due to thenumerous disadvantages attaching to such mode of proce dure. Forinstance, if the chaplets were made of magnesium or aluminum, it was Ifond that, owing to the nearly equal melting lift pointsof the chapletand magnesium and to the resence of an oride film usually found on caplets consisting of maesium, such chaplets did not fuse satisfactorilydug oor castin e, g. tin, bismuth, etc, and alloys thereof, have beenproposed and tried as chaplets, but all such as have been suggestedpossess the disadvantage of forming an alloy between the metal of thechaplet and the mesium of such constitution that a brittle zone resultsin the finished casting.

ln making magnesium castings it has,

therefore been established practice to avoid w the use of chaplets as bysuspending the cores processes ofmaking cored magnesium 11 castingswherein chaplets are employed for Application lied July 1, 1988. SerialIto. 880,589.

from the top of the procedure can not always be employed withoutundulycomplicating the mold and further, when used, is often excessivelytimemonsuming and expensive. Byusing cha lets consistin of cadmium Ihave been ab e-to support dry sand cores in molds wherein the thicknessof finished casting apprbximated one eighth of one inch, and havedetermined that such practice results in substantially perfect fusionbetween the chaplet and the magnesium, whereby a finished casting ofexcel- I lent quality free from brittlenessis obtained. In certaininstances,

thin section is to be cast, it may be found desirable to employ an alloyof cadmium with relatively small amounts of other suitable thickness ofthe section to be cast is somewhat greater, e. g. one to two inches ormore l havefound it advantageous to use a chaplet consisting of cadmiumalloyed with an amount of magnesium sufficient to elevate the meltingpoint of the chaplet to a temperature such that the chaplet does notlose its strength by fusion with the magnesium being poured into themold before performing its function of supporting the core. ft isevident that the composition of the chaplet may be varied over a widerange, since cadmium and magnesium alloy perfectly in all'proportions,and further it is evident that a chaplet of any desired melting point inthe range between the melting points of cadmium and magnesium may bereadily obtained, or y of zinc, tin, etc., may be incorporated with thecadmium-magnesium that small amounts in order to improve the propertiesthereof.

- llllanifestly, my chaplet may be constructat 7 ed in any suitableform, e. double head with round or square plates, uble head waterbaclr,saddleback or bridge, curved, ferrule, etc., Without departing from thespirit of my invention. Y I

mold. However, such such as 1n supporting acore ill a mold wherebetweenan extremely of pure cadmium can be Other modes of applying theprinciple of my invention may e employed instead of those explained,change'being made as re-' gards the steps and means herein disclosed,-provided those stated by any of the following claims ,or theirequivalent be employed.

I therefore particularly point out and distinctlf claim as myinvention 1. n castingmagnesium thev method of maintaining a dry sandcore in a substantially fixed position in a mold which comprisesinterposing between the core and the mold a chaplet comprising cadmium.

2. In casting magnesium the method of maintaining a dry sand core in asubstan tially fixed position in a mold which comprises interposingbetween the core and the mold achaplet comprising cadmium'having alloyedtherewith magnesium.

3. In casting magnesium the method of maintaining a dry sand core in asubstantially fixed position in a mold which comprises interposingbetween the core and the mold a chaplet consisting of cadmium havingalloyed therewith a relatively small amount of a metal from the classconsisting of zinc, lead, and tin.

4. A chaplet for use in maintaining a dry sand core in a substantiallyfixed position in a mold while casting magnesium 1D the said moldcomposed predominantly of cadmium.

5. A chaplet for use in maintaining a dry sand core in a substantiallyfixed position in a mold while casting magnesium in the said moldconsisting of cadmlum "having alloyed therewith magnesium.

6. A chaplet for use in maintaining a dry sand core in a substantiallyfixed position in a mold while casting ma esium in the said moldconsisting of cadmium having alloyed therewith a relatively small amountof a metal from-the class consisting of zinc, lead, and

tin. I

Signed by me this 28th day of June, 1932. LESLIE BROWN.

